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With your current settings 32 G is probably the max size for the datafile

a quick work around would be to add an extra datafile to the tablespace.
Something like this (ensure that you have enough disk space for the max sizes)
alter tablespace IFSAPP_DATA add datafile 'G:\oradata\afsl\ifsapp_data02.dbf' SIZE 128K AUTOEXTEND ON NEXT 128K MAXSIZE 10G;

Add many small files to that tablespace. Keeping one big file is very bad practice. So agree with all other Experts - they are entirelly correct. Big files also are fragmented in different extents that makes them slow. Also backup and restore are complex and dangerous. There is no benefit from keeping big files.